METHOD OF DETECTING ERRONEOUS GPS GROUND SPEED ON GROUND

• US 20070299608A1
• Filed: 06/26/2006
• Published: 12/27/2007
• Est. Priority Date: 06/26/2006
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Ishihara, Yasuo, Conner, Kevin J., Johnson, Steve C.
• Granted Patent: US 8,271,191 B2
• Time in Patent Office: Days
• US Class Current: 701/213
• CPC Class Codes: G01S 19/20 Integrity monitoring, fault detection or fault isolation of space segment
• CPC Class Codes: G01S 19/52 Determining velocity

Abstract

Methods and systems for determining reliability of Global Positioning System (GPS) ground speed. An example system receives GPS track information and GPS ground speed, determines a change in GPS track information and determines reliability of the GPS ground speed based on the determined change in GPS track information relative to the GPS ground speed. The system sets a GPS ground speed based on the determined reliability. A GPS ground speed output is set to zero, if the GPS ground speed is determined unreliable and the GPS ground speed output is set to the GPS ground speed, if the GPS ground speed is determined reliable. The system sends the GPS ground speed output to a Runway Awareness and Advisory System (RAAS). Also, the system sets the GPS ground speed output to zero, if a received GPS ground speed validity signal or a received GPS track validity signal indicate invalid.

Claims

1. A method for determining reliability of Global Positioning System (GPS) ground speed, the method comprising:

receiving GPS track information and GPS ground speed;

determining a change in GPS track information;

determining reliability of the GPS ground speed based on the determined change in GPS track information relative to the GPS ground speed.

2. The method of claim 1, further comprising setting a GPS ground speed based on the determined reliability.

3. The method of claim 2, further comprising setting the GPS ground speed output to zero, if the GPS ground speed is determined unreliable.

4. The method of claim 3, further comprising setting the GPS ground speed output to the GPS ground speed, if the GPS ground speed is determined reliable.

5. The method of claim 4, further comprising sending the GPS ground speed output to a Runway Awareness and Advisory System (RAAS).

6. The method of claim 4, further comprising sending the GPS ground speed output to an Enhanced Ground Proximity Warning System.

7. The method of claim 4, further comprising:

receiving at least one of a GPS ground speed validity signal and a GPS track validity signal; and

setting the GPS ground speed output to zero, if at least one of the GPS ground speed validity signal or the GPS track validity signal indicates invalid.

8. The method of claim 7, further comprising sending the GPS ground speed output to a Runway Awareness and Advisory System (RAAS).

9. A system for determining reliability of Global Positioning System (GPS) ground speed, the system comprising:

a first component for receiving GPS track information and GPS ground speed;

a second component for determining a change in GPS track information;

a third component for determining reliability of the GPS ground speed based on the determined change in GPS track information relative to the GPS ground speed.

10. The system of claim 9, further comprising a fourth component for setting a GPS ground speed based on the determined reliability.

11. The system of claim 10, wherein the fourth component sets the GPS ground speed output to zero, if the GPS ground speed is determined unreliable.

12. The system of claim 11, wherein the fourth component sets the GPS ground speed output to the GPS ground speed, if the GPS ground speed is determined reliable.

13. The system of claim 12, further comprising a fifth component for sending the GPS ground speed output to a Runway Awareness and Advisory System (RAAS).

14. The system of claim 11, further comprising:

a fifth component for receiving at least one of a GPS ground speed validity signal and a GPS track validity signal,

wherein the fourth component sets the GPS ground speed output to zero, if one of the GPS ground speed validity signal or the GPS track validity signal indicates invalid.

15. The system of claim 14, further comprising a sixth component for sending the GPS ground speed output to a Runway Awareness and Advisory System (RAAS).

16. The system of claim 9, wherein the first, second, and third components are included in a Runway Awareness and Advisory System (RAAS).

17. The system of claim 9, wherein the first, second, and third components are included in an Enhanced Ground Proximity Warning System.